crypto: Remove interface from crypto.Signature

Signatures are now []byte, which saves on the number of bytes after
amino encoding

(squash this) address Ismail's comment

abci/example/example_test.go

@@ -7,6 +7,8 @@ import (
 	"testing"
 	"time"
 
+	"github.com/stretchr/testify/require"
+
 	"google.golang.org/grpc"
 
 	"golang.org/x/net/context"
@@ -43,7 +45,7 @@ func testStream(t *testing.T, app types.Application) {
 	server := abciserver.NewSocketServer("unix://test.sock", app)
 	server.SetLogger(log.TestingLogger().With("module", "abci-server"))
 	if err := server.Start(); err != nil {
-		t.Fatalf("Error starting socket server: %v", err.Error())
+		require.NoError(t, err, "Error starting socket server")
 	}
 	defer server.Stop()
 

consensus/types/round_state_test.go

@@ -23,7 +23,7 @@ func BenchmarkRoundStateDeepCopy(b *testing.B) {
 			Hash: cmn.RandBytes(20),
 		},
 	}
-	sig := ed25519.SignatureEd25519{}
+	sig := make([]byte, ed25519.SignatureEd25519Size)
 	for i := 0; i < nval; i++ {
 		precommits[i] = &types.Vote{
 			ValidatorAddress: types.Address(cmn.RandBytes(20)),

crypto/README.md

@@ -24,9 +24,7 @@ crypto `.Bytes()` uses Amino:binary encoding, but Amino:JSON is also supported.
 Example Amino:JSON encodings:
 
 ed25519.PrivKeyEd25519     - {"type":"954568A3288910","value":"EVkqJO/jIXp3rkASXfh9YnyToYXRXhBr6g9cQVxPFnQBP/5povV4HTjvsy530kybxKHwEi85iU8YL0qQhSYVoQ=="}
-crypto.SignatureEd25519   - {"type":"6BF5903DA1DB28","value":"77sQNZOrf7ltExpf7AV1WaYPCHbyRLgjBsoWVzcduuLk+jIGmYk+s5R6Emm29p12HeiNAuhUJgdFGmwkpeGJCA=="}
 ed25519.PubKeyEd25519      - {"type":"AC26791624DE60","value":"AT/+aaL1eB0477Mud9JMm8Sh8BIvOYlPGC9KkIUmFaE="}
 crypto.PrivKeySecp256k1   - {"type":"019E82E1B0F798","value":"zx4Pnh67N+g2V+5vZbQzEyRerX9c4ccNZOVzM9RvJ0Y="}
-crypto.SignatureSecp256k1 - {"type":"6D1EA416E1FEE8","value":"MEUCIQCIg5TqS1l7I+MKTrSPIuUN2+4m5tA29dcauqn3NhEJ2wIgICaZ+lgRc5aOTVahU/XoLopXKn8BZcl0bnuYWLvohR8="}
 crypto.PubKeySecp256k1    - {"type":"F8CCEAEB5AE980","value":"A8lPKJXcNl5VHt1FK8a244K9EJuS4WX1hFBnwisi0IJx"}
 ```

crypto/crypto.go

@@ -6,7 +6,7 @@ import (
 
 type PrivKey interface {
 	Bytes() []byte
-	Sign(msg []byte) (Signature, error)
+	Sign(msg []byte) ([]byte, error)
 	PubKey() PubKey
 	Equals(PrivKey) bool
 }
@@ -19,16 +19,10 @@ type Address = cmn.HexBytes
 type PubKey interface {
 	Address() Address
 	Bytes() []byte
-	VerifyBytes(msg []byte, sig Signature) bool
+	VerifyBytes(msg []byte, sig []byte) bool
 	Equals(PubKey) bool
 }
 
-type Signature interface {
-	Bytes() []byte
-	IsZero() bool
-	Equals(Signature) bool
-}
-
 type Symmetric interface {
 	Keygen() []byte
 	Encrypt(plaintext []byte, secret []byte) (ciphertext []byte)

crypto/ed25519/ed25519.go

@@ -11,7 +11,6 @@ import (
 	amino "github.com/tendermint/go-amino"
 	"github.com/tendermint/tendermint/crypto"
 	"github.com/tendermint/tendermint/crypto/tmhash"
-	cmn "github.com/tendermint/tendermint/libs/common"
 )
 
 //-------------------------------------
@@ -19,9 +18,11 @@ import (
 var _ crypto.PrivKey = PrivKeyEd25519{}
 
 const (
-	Ed25519PrivKeyAminoRoute   = "tendermint/PrivKeyEd25519"
-	Ed25519PubKeyAminoRoute    = "tendermint/PubKeyEd25519"
-	Ed25519SignatureAminoRoute = "tendermint/SignatureEd25519"
+	Ed25519PrivKeyAminoRoute = "tendermint/PrivKeyEd25519"
+	Ed25519PubKeyAminoRoute  = "tendermint/PubKeyEd25519"
+	// Size of an Edwards25519 signature. Namely the size of a compressed
+	// Edwards25519 point, and a field element. Both of which are 32 bytes.
+	SignatureEd25519Size = 64
 )
 
 var cdc = amino.NewCodec()
@@ -34,10 +35,6 @@ func init() {
 	cdc.RegisterInterface((*crypto.PrivKey)(nil), nil)
 	cdc.RegisterConcrete(PrivKeyEd25519{},
 		Ed25519PrivKeyAminoRoute, nil)
-
-	cdc.RegisterInterface((*crypto.Signature)(nil), nil)
-	cdc.RegisterConcrete(SignatureEd25519{},
-		Ed25519SignatureAminoRoute, nil)
 }
 
 // PrivKeyEd25519 implements crypto.PrivKey.
@@ -49,10 +46,10 @@ func (privKey PrivKeyEd25519) Bytes() []byte {
 }
 
 // Sign produces a signature on the provided message.
-func (privKey PrivKeyEd25519) Sign(msg []byte) (crypto.Signature, error) {
+func (privKey PrivKeyEd25519) Sign(msg []byte) ([]byte, error) {
 	privKeyBytes := [64]byte(privKey)
 	signatureBytes := ed25519.Sign(&privKeyBytes, msg)
-	return SignatureEd25519(*signatureBytes), nil
+	return signatureBytes[:], nil
 }
 
 // PubKey gets the corresponding public key from the private key.
@@ -159,15 +156,15 @@ func (pubKey PubKeyEd25519) Bytes() []byte {
 	return bz
 }
 
-func (pubKey PubKeyEd25519) VerifyBytes(msg []byte, sig_ crypto.Signature) bool {
+func (pubKey PubKeyEd25519) VerifyBytes(msg []byte, sig_ []byte) bool {
 	// make sure we use the same algorithm to sign
-	sig, ok := sig_.(SignatureEd25519)
-	if !ok {
+	if len(sig_) != SignatureEd25519Size {
 		return false
 	}
+	sig := new([SignatureEd25519Size]byte)
+	copy(sig[:], sig_)
 	pubKeyBytes := [PubKeyEd25519Size]byte(pubKey)
-	sigBytes := [SignatureEd25519Size]byte(sig)
-	return ed25519.Verify(&pubKeyBytes, msg, &sigBytes)
+	return ed25519.Verify(&pubKeyBytes, msg, sig)
 }
 
 // ToCurve25519 takes a public key and returns its representation on
@@ -197,40 +194,3 @@ func (pubKey PubKeyEd25519) Equals(other crypto.PubKey) bool {
 		return false
 	}
 }
-
-//-------------------------------------
-
-var _ crypto.Signature = SignatureEd25519{}
-
-// Size of an Edwards25519 signature. Namely the size of a compressed
-// Edwards25519 point, and a field element. Both of which are 32 bytes.
-const SignatureEd25519Size = 64
-
-// SignatureEd25519 implements crypto.Signature
-type SignatureEd25519 [SignatureEd25519Size]byte
-
-func (sig SignatureEd25519) Bytes() []byte {
-	bz, err := cdc.MarshalBinaryBare(sig)
-	if err != nil {
-		panic(err)
-	}
-	return bz
-}
-
-func (sig SignatureEd25519) IsZero() bool { return len(sig) == 0 }
-
-func (sig SignatureEd25519) String() string { return fmt.Sprintf("/%X.../", cmn.Fingerprint(sig[:])) }
-
-func (sig SignatureEd25519) Equals(other crypto.Signature) bool {
-	if otherEd, ok := other.(SignatureEd25519); ok {
-		return subtle.ConstantTimeCompare(sig[:], otherEd[:]) == 1
-	} else {
-		return false
-	}
-}
-
-func SignatureEd25519FromBytes(data []byte) crypto.Signature {
-	var sig SignatureEd25519
-	copy(sig[:], data)
-	return sig
-}

crypto/ed25519/ed25519_test.go

@@ -23,9 +23,7 @@ func TestSignAndValidateEd25519(t *testing.T) {
 
 	// Mutate the signature, just one bit.
 	// TODO: Replace this with a much better fuzzer, tendermint/ed25519/issues/10
-	sigEd := sig.(ed25519.SignatureEd25519)
-	sigEd[7] ^= byte(0x01)
-	sig = sigEd
+	sig[7] ^= byte(0x01)
 
 	assert.False(t, pubKey.VerifyBytes(msg, sig))
 }

crypto/encoding/amino/amino.go

@@ -33,12 +33,6 @@ func RegisterAmino(cdc *amino.Codec) {
 		"tendermint/PrivKeyEd25519", nil)
 	cdc.RegisterConcrete(secp256k1.PrivKeySecp256k1{},
 		"tendermint/PrivKeySecp256k1", nil)
-
-	cdc.RegisterInterface((*crypto.Signature)(nil), nil)
-	cdc.RegisterConcrete(ed25519.SignatureEd25519{},
-		"tendermint/SignatureEd25519", nil)
-	cdc.RegisterConcrete(secp256k1.SignatureSecp256k1{},
-		"tendermint/SignatureSecp256k1", nil)
 }
 
 func PrivKeyFromBytes(privKeyBytes []byte) (privKey crypto.PrivKey, err error) {
@@ -50,8 +44,3 @@ func PubKeyFromBytes(pubKeyBytes []byte) (pubKey crypto.PubKey, err error) {
 	err = cdc.UnmarshalBinaryBare(pubKeyBytes, &pubKey)
 	return
 }
-
-func SignatureFromBytes(pubKeyBytes []byte) (pubKey crypto.Signature, err error) {
-	err = cdc.UnmarshalBinaryBare(pubKeyBytes, &pubKey)
-	return
-}

crypto/encoding/amino/encode_test.go

@@ -15,12 +15,14 @@ type byter interface {
 	Bytes() []byte
 }
 
-func checkAminoBinary(t *testing.T, src byter, dst interface{}, size int) {
+func checkAminoBinary(t *testing.T, src, dst interface{}, size int) {
 	// Marshal to binary bytes.
 	bz, err := cdc.MarshalBinaryBare(src)
 	require.Nil(t, err, "%+v", err)
-	// Make sure this is compatible with current (Bytes()) encoding.
-	assert.Equal(t, src.Bytes(), bz, "Amino binary vs Bytes() mismatch")
+	if byterSrc, ok := src.(byter); ok {
+		// Make sure this is compatible with current (Bytes()) encoding.
+		assert.Equal(t, byterSrc.Bytes(), bz, "Amino binary vs Bytes() mismatch")
+	}
 	// Make sure we have the expected length.
 	if size != -1 {
 		assert.Equal(t, size, len(bz), "Amino binary size mismatch")
@@ -53,8 +55,6 @@ func ExamplePrintRegisteredTypes() {
 	//| PubKeySecp256k1 | tendermint/PubKeySecp256k1 | 0xEB5AE987 | 0x21 |  |
 	//| PrivKeyEd25519 | tendermint/PrivKeyEd25519 | 0xA3288910 | 0x40 |  |
 	//| PrivKeySecp256k1 | tendermint/PrivKeySecp256k1 | 0xE1B0F79B | 0x20 |  |
-	//| SignatureEd25519 | tendermint/SignatureEd25519 | 0x2031EA53 | 0x40 |  |
-	//| SignatureSecp256k1 | tendermint/SignatureSecp256k1 | 0x7FC4A495 | variable |  |
 }
 
 func TestKeyEncodings(t *testing.T) {
@@ -84,13 +84,11 @@ func TestKeyEncodings(t *testing.T) {
 		assert.EqualValues(t, tc.privKey, priv3, "tc #%d", tcIndex)
 
 		// Check (de/en)codings of Signatures.
-		var sig1, sig2, sig3 crypto.Signature
+		var sig1, sig2 []byte
 		sig1, err := tc.privKey.Sign([]byte("something"))
 		assert.NoError(t, err, "tc #%d", tcIndex)
 		checkAminoBinary(t, sig1, &sig2, -1) // Signature size changes for Secp anyways.
 		assert.EqualValues(t, sig1, sig2, "tc #%d", tcIndex)
-		checkAminoJSON(t, sig1, &sig3, false) // TODO also check Prefix bytes.
-		assert.EqualValues(t, sig1, sig3, "tc #%d", tcIndex)
 
 		// Check (de/en)codings of PubKeys.
 		pubKey := tc.privKey.PubKey()
@@ -105,7 +103,7 @@ func TestKeyEncodings(t *testing.T) {
 func TestNilEncodings(t *testing.T) {
 
 	// Check nil Signature.
-	var a, b crypto.Signature
+	var a, b []byte
 	checkAminoJSON(t, &a, &b, true)
 	assert.EqualValues(t, a, b)
 

crypto/secp256k1/secp256k1.go

@@ -10,15 +10,13 @@ import (
 	secp256k1 "github.com/btcsuite/btcd/btcec"
 	amino "github.com/tendermint/go-amino"
 	"github.com/tendermint/tendermint/crypto"
-	"github.com/tendermint/tendermint/libs/common"
 	"golang.org/x/crypto/ripemd160"
 )
 
 //-------------------------------------
 const (
-	Secp256k1PrivKeyAminoRoute   = "tendermint/PrivKeySecp256k1"
-	Secp256k1PubKeyAminoRoute    = "tendermint/PubKeySecp256k1"
-	Secp256k1SignatureAminoRoute = "tendermint/SignatureSecp256k1"
+	Secp256k1PrivKeyAminoRoute = "tendermint/PrivKeySecp256k1"
+	Secp256k1PubKeyAminoRoute  = "tendermint/PubKeySecp256k1"
 )
 
 var cdc = amino.NewCodec()
@@ -31,10 +29,6 @@ func init() {
 	cdc.RegisterInterface((*crypto.PrivKey)(nil), nil)
 	cdc.RegisterConcrete(PrivKeySecp256k1{},
 		Secp256k1PrivKeyAminoRoute, nil)
-
-	cdc.RegisterInterface((*crypto.Signature)(nil), nil)
-	cdc.RegisterConcrete(SignatureSecp256k1{},
-		Secp256k1SignatureAminoRoute, nil)
 }
 
 //-------------------------------------
@@ -50,13 +44,13 @@ func (privKey PrivKeySecp256k1) Bytes() []byte {
 }
 
 // Sign creates an ECDSA signature on curve Secp256k1, using SHA256 on the msg.
-func (privKey PrivKeySecp256k1) Sign(msg []byte) (crypto.Signature, error) {
+func (privKey PrivKeySecp256k1) Sign(msg []byte) ([]byte, error) {
 	priv, _ := secp256k1.PrivKeyFromBytes(secp256k1.S256(), privKey[:])
 	sig, err := priv.Sign(crypto.Sha256(msg))
 	if err != nil {
 		return nil, err
 	}
-	return SignatureSecp256k1(sig.Serialize()), nil
+	return sig.Serialize(), nil
 }
 
 // PubKey performs the point-scalar multiplication from the privKey on the
@@ -142,13 +136,7 @@ func (pubKey PubKeySecp256k1) Bytes() []byte {
 	return bz
 }
 
-func (pubKey PubKeySecp256k1) VerifyBytes(msg []byte, interfaceSig crypto.Signature) bool {
-	// and assert same algorithm to sign and verify
-	sig, ok := interfaceSig.(SignatureSecp256k1)
-	if !ok {
-		return false
-	}
-
+func (pubKey PubKeySecp256k1) VerifyBytes(msg []byte, sig []byte) bool {
 	pub, err := secp256k1.ParsePubKey(pubKey[:], secp256k1.S256())
 	if err != nil {
 		return false
@@ -170,38 +158,3 @@ func (pubKey PubKeySecp256k1) Equals(other crypto.PubKey) bool {
 	}
 	return false
 }
-
-//-------------------------------------
-
-var _ crypto.Signature = SignatureSecp256k1{}
-
-// SignatureSecp256k1 implements crypto.Signature
-type SignatureSecp256k1 []byte
-
-func (sig SignatureSecp256k1) Bytes() []byte {
-	bz, err := cdc.MarshalBinaryBare(sig)
-	if err != nil {
-		panic(err)
-	}
-	return bz
-}
-
-func (sig SignatureSecp256k1) IsZero() bool { return len(sig) == 0 }
-
-func (sig SignatureSecp256k1) String() string {
-	return fmt.Sprintf("/%X.../", common.Fingerprint(sig[:]))
-}
-
-func (sig SignatureSecp256k1) Equals(other crypto.Signature) bool {
-	if otherSecp, ok := other.(SignatureSecp256k1); ok {
-		return subtle.ConstantTimeCompare(sig[:], otherSecp[:]) == 1
-	} else {
-		return false
-	}
-}
-
-func SignatureSecp256k1FromBytes(data []byte) crypto.Signature {
-	sig := make(SignatureSecp256k1, len(data))
-	copy(sig[:], data)
-	return sig
-}

crypto/secp256k1/secpk256k1_test.go

@@ -59,9 +59,7 @@ func TestSignAndValidateSecp256k1(t *testing.T) {
 	assert.True(t, pubKey.VerifyBytes(msg, sig))
 
 	// Mutate the signature, just one bit.
-	sigEd := sig.(secp256k1.SignatureSecp256k1)
-	sigEd[3] ^= byte(0x01)
-	sig = sigEd
+	sig[3] ^= byte(0x01)
 
 	assert.False(t, pubKey.VerifyBytes(msg, sig))
 }

node/id.go

@@ -26,7 +26,7 @@ type NodeGreeting struct {
 
 type SignedNodeGreeting struct {
 	NodeGreeting
-	Signature crypto.Signature
+	Signature []byte
 }
 
 func (pnid *PrivNodeID) SignGreeting() *SignedNodeGreeting {

p2p/conn/secret_connection.go

@@ -285,7 +285,7 @@ func sort32(foo, bar *[32]byte) (lo, hi *[32]byte) {
 	return
 }
 
-func signChallenge(challenge *[32]byte, locPrivKey crypto.PrivKey) (signature crypto.Signature) {
+func signChallenge(challenge *[32]byte, locPrivKey crypto.PrivKey) (signature []byte) {
 	signature, err := locPrivKey.Sign(challenge[:])
 	// TODO(ismail): let signChallenge return an error instead
 	if err != nil {
@@ -296,10 +296,10 @@ func signChallenge(challenge *[32]byte, locPrivKey crypto.PrivKey) (signature cr
 
 type authSigMessage struct {
 	Key crypto.PubKey
-	Sig crypto.Signature
+	Sig []byte
 }
 
-func shareAuthSignature(sc *SecretConnection, pubKey crypto.PubKey, signature crypto.Signature) (recvMsg authSigMessage, err error) {
+func shareAuthSignature(sc *SecretConnection, pubKey crypto.PubKey, signature []byte) (recvMsg authSigMessage, err error) {
 
 	// Send our info and receive theirs in tandem.
 	var trs, _ = cmn.Parallel(

privval/priv_validator.go

@@ -38,14 +38,14 @@ func voteToStep(vote *types.Vote) int8 {
 // to prevent double signing.
 // NOTE: the directory containing the pv.filePath must already exist.
 type FilePV struct {
-	Address       types.Address    `json:"address"`
-	PubKey        crypto.PubKey    `json:"pub_key"`
-	LastHeight    int64            `json:"last_height"`
-	LastRound     int              `json:"last_round"`
-	LastStep      int8             `json:"last_step"`
-	LastSignature crypto.Signature `json:"last_signature,omitempty"` // so we dont lose signatures XXX Why would we lose signatures?
-	LastSignBytes cmn.HexBytes     `json:"last_signbytes,omitempty"` // so we dont lose signatures XXX Why would we lose signatures?
-	PrivKey       crypto.PrivKey   `json:"priv_key"`
+	Address       types.Address  `json:"address"`
+	PubKey        crypto.PubKey  `json:"pub_key"`
+	LastHeight    int64          `json:"last_height"`
+	LastRound     int            `json:"last_round"`
+	LastStep      int8           `json:"last_step"`
+	LastSignature []byte         `json:"last_signature,omitempty"` // so we dont lose signatures XXX Why would we lose signatures?
+	LastSignBytes cmn.HexBytes   `json:"last_signbytes,omitempty"` // so we dont lose signatures XXX Why would we lose signatures?
+	PrivKey       crypto.PrivKey `json:"priv_key"`
 
 	// For persistence.
 	// Overloaded for testing.
@@ -138,7 +138,7 @@ func (pv *FilePV) save() {
 // Reset resets all fields in the FilePV.
 // NOTE: Unsafe!
 func (pv *FilePV) Reset() {
-	var sig crypto.Signature
+	var sig []byte
 	pv.LastHeight = 0
 	pv.LastRound = 0
 	pv.LastStep = 0
@@ -277,7 +277,7 @@ func (pv *FilePV) signProposal(chainID string, proposal *types.Proposal) error {
 
 // Persist height/round/step and signature
 func (pv *FilePV) saveSigned(height int64, round int, step int8,
-	signBytes []byte, sig crypto.Signature) {
+	signBytes []byte, sig []byte) {
 
 	pv.LastHeight = height
 	pv.LastRound = round

privval/priv_validator_test.go

@@ -10,7 +10,6 @@ import (
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"github.com/tendermint/tendermint/crypto"
 	"github.com/tendermint/tendermint/crypto/ed25519"
 	"github.com/tendermint/tendermint/types"
 )
@@ -194,7 +193,7 @@ func TestDifferByTimestamp(t *testing.T) {
 
 		// manipulate the timestamp. should get changed back
 		proposal.Timestamp = proposal.Timestamp.Add(time.Millisecond)
-		var emptySig crypto.Signature
+		var emptySig []byte
 		proposal.Signature = emptySig
 		err = privVal.SignProposal("mychainid", proposal)
 		assert.NoError(t, err, "expected no error on signing same proposal")
@@ -218,7 +217,7 @@ func TestDifferByTimestamp(t *testing.T) {
 
 		// manipulate the timestamp. should get changed back
 		vote.Timestamp = vote.Timestamp.Add(time.Millisecond)
-		var emptySig crypto.Signature
+		var emptySig []byte
 		vote.Signature = emptySig
 		err = privVal.SignVote("mychainid", vote)
 		assert.NoError(t, err, "expected no error on signing same vote")

types/heartbeat.go

@@ -3,7 +3,6 @@ package types
 import (
 	"fmt"
 
-	"github.com/tendermint/tendermint/crypto"
 	cmn "github.com/tendermint/tendermint/libs/common"
 )
 
@@ -13,12 +12,12 @@ import (
 // json field tags because we always want the JSON
 // representation to be in its canonical form.
 type Heartbeat struct {
-	ValidatorAddress Address          `json:"validator_address"`
-	ValidatorIndex   int              `json:"validator_index"`
-	Height           int64            `json:"height"`
-	Round            int              `json:"round"`
-	Sequence         int              `json:"sequence"`
-	Signature        crypto.Signature `json:"signature"`
+	ValidatorAddress Address `json:"validator_address"`
+	ValidatorIndex   int     `json:"validator_index"`
+	Height           int64   `json:"height"`
+	Round            int     `json:"round"`
+	Sequence         int     `json:"sequence"`
+	Signature        []byte  `json:"signature"`
 }
 
 // SignBytes returns the Heartbeat bytes for signing.
@@ -48,5 +47,6 @@ func (heartbeat *Heartbeat) String() string {
 
 	return fmt.Sprintf("Heartbeat{%v:%X %v/%02d (%v) %v}",
 		heartbeat.ValidatorIndex, cmn.Fingerprint(heartbeat.ValidatorAddress),
-		heartbeat.Height, heartbeat.Round, heartbeat.Sequence, heartbeat.Signature)
+		heartbeat.Height, heartbeat.Round, heartbeat.Sequence,
+		fmt.Sprintf("/%X.../", cmn.Fingerprint(heartbeat.Signature[:])))
 }

types/heartbeat_test.go

@@ -24,13 +24,13 @@ func TestHeartbeatString(t *testing.T) {
 	require.Contains(t, nilHb.String(), "nil", "expecting a string and no panic")
 
 	hb := &Heartbeat{ValidatorIndex: 1, Height: 11, Round: 2}
-	require.Equal(t, hb.String(), "Heartbeat{1:000000000000 11/02 (0) <nil>}")
+	require.Equal(t, "Heartbeat{1:000000000000 11/02 (0) /000000000000.../}", hb.String())
 
 	var key ed25519.PrivKeyEd25519
 	sig, err := key.Sign([]byte("Tendermint"))
 	require.NoError(t, err)
 	hb.Signature = sig
-	require.Equal(t, hb.String(), "Heartbeat{1:000000000000 11/02 (0) /FF41E371B9BF.../}")
+	require.Equal(t, "Heartbeat{1:000000000000 11/02 (0) /FF41E371B9BF.../}", hb.String())
 }
 
 func TestHeartbeatWriteSignBytes(t *testing.T) {

types/proposal.go

@@ -4,8 +4,6 @@ import (
 	"errors"
 	"fmt"
 	"time"
-
-	"github.com/tendermint/tendermint/crypto"
 )
 
 var (
@@ -19,13 +17,13 @@ var (
 // to be considered valid. It may depend on votes from a previous round,
 // a so-called Proof-of-Lock (POL) round, as noted in the POLRound and POLBlockID.
 type Proposal struct {
-	Height           int64            `json:"height"`
-	Round            int              `json:"round"`
-	Timestamp        time.Time        `json:"timestamp"`
-	BlockPartsHeader PartSetHeader    `json:"block_parts_header"`
-	POLRound         int              `json:"pol_round"`    // -1 if null.
-	POLBlockID       BlockID          `json:"pol_block_id"` // zero if null.
-	Signature        crypto.Signature `json:"signature"`
+	Height           int64         `json:"height"`
+	Round            int           `json:"round"`
+	Timestamp        time.Time     `json:"timestamp"`
+	BlockPartsHeader PartSetHeader `json:"block_parts_header"`
+	POLRound         int           `json:"pol_round"`    // -1 if null.
+	POLBlockID       BlockID       `json:"pol_block_id"` // zero if null.
+	Signature        []byte        `json:"signature"`
 }
 
 // NewProposal returns a new Proposal.

types/proposal_test.go

@@ -39,7 +39,7 @@ func TestProposalSignable(t *testing.T) {
 
 func TestProposalString(t *testing.T) {
 	str := testProposal.String()
-	expected := `Proposal{12345/23456 111:626C6F636B70 (-1,:0:000000000000) <nil> @ 2018-02-11T07:09:22.765Z}`
+	expected := `Proposal{12345/23456 111:626C6F636B70 (-1,:0:000000000000) [] @ 2018-02-11T07:09:22.765Z}`
 	if str != expected {
 		t.Errorf("Got unexpected string for Proposal. Expected:\n%v\nGot:\n%v", expected, str)
 	}

types/protobuf_test.go

@@ -111,7 +111,7 @@ type pubKeyEddie struct{}
 
 func (pubKeyEddie) Address() Address                                  { return []byte{} }
 func (pubKeyEddie) Bytes() []byte                                     { return []byte{} }
-func (pubKeyEddie) VerifyBytes(msg []byte, sig crypto.Signature) bool { return false }
+func (pubKeyEddie) VerifyBytes(msg []byte, sig []byte) bool { return false }
 func (pubKeyEddie) Equals(crypto.PubKey) bool                         { return false }
 
 func TestABCIValidatorFromPubKeyAndPower(t *testing.T) {

types/vote.go

@@ -68,7 +68,7 @@ type Vote struct {
 	Timestamp        time.Time        `json:"timestamp"`
 	Type             byte             `json:"type"`
 	BlockID          BlockID          `json:"block_id"` // zero if vote is nil.
-	Signature        crypto.Signature `json:"signature"`
+	Signature        []byte `json:"signature"`
 }
 
 func (vote *Vote) SignBytes(chainID string) []byte {

types/vote_set.go

@@ -179,7 +179,7 @@ func (voteSet *VoteSet) addVote(vote *Vote) (added bool, err error) {
 
 	// If we already know of this vote, return false.
 	if existing, ok := voteSet.getVote(valIndex, blockKey); ok {
-		if existing.Signature.Equals(vote.Signature) {
+		if bytes.Equal(existing.Signature, vote.Signature) {
 			return false, nil // duplicate
 		}
 		return false, errors.Wrapf(ErrVoteNonDeterministicSignature, "Existing vote: %v; New vote: %v", existing, vote)